Please assist me! Is TB Joshua a true prophet of…

Please assist me! Is TB Joshua a true prophet of God? If not and why not? If yes and why yes? What are the signs of a false prophet and the signs of true prophet? Does he truly preach the Gospel of Christ or not, calling people to repentance and holiness? Some people say he does the work of healing, deliverance casting demons in the name of the false Christ? Other say he does the work of healing, deliverance casting out demons in the name of the Christ Jesus our Lord? Some people said, “Some of his prophecies did not come true.” There is a great division among Vietnamese Christians in Vietnam about TB Joshua and they need a clear, authentic and honest answer with biblical truths. Thank you so much for your assistance! May the Lord Jesus Christ, our Savior richly bless you all!